season       gender        approved    age       prog    grade
spring        man          FALSE       old       FRIST     C
spring        man             NA       old       FRIST    <NA>
fall        woman             NA       old       FRIST    <NA>
fall        woman           TRUE       old       FRIST     B
fall        woman             NA       old       NMFIK    <NA>
fall         man          FALSE        old       FRIST     B